Bekim Fehmiu
— Count Alexander Cagliostro / Giuseppe Balsamo
Curd Jürgens
— Cardinal Braschi
Ida Galli
— Serafina Cagliostro
Anna Orso
— The Queen
Luigi Pistilli
— Cardinal de Rohan
Adolfo Lastretti
— Prelate in Rome
Luigi Montini
— Prelate in Rome
Rosanna Schiaffino
— Lorenza Balsamo
Alessandro Haber
— Beggar in Rome
Gaby Verusky
— A Paralytic Beggar
Antonio Pierfederici
— A naturalist monk
Robert Alda
— Pope Clement XIII
Massimo Girotti
— Giacomo Casanova
Franco Ressel
— Morandi, News editor
Alessandro Perrella
— Mendacious cripple
Corrado Annicelli
Ada Pometti
— French noblewoman
Ugo Frisoli
Veronica Guis
Andrea Scotti
— Mendacious mute
Renzo Rinaldi
— Monk
Brunello Chiodetti
Rodolfo Puttignani
— Napoleon (uncredited)
